Electrical switch



May 18 1926.

- H. GERNSBACK ELECTRICAL SWITCH Filed fept. 18, 1924 Suitable PatentedMay/18, 1926. l

UNITED. STATES- HUGO GERNSBACK, 0F NEW YORK, NYY.

PATENT OFFICE.

appucauen mea september 1e, 1924. serial No. 738,539.

' This invention electrical switches.

An object of the invention is the prorelates to 4vision of a switchhaving a movable plunger adapted to be retained between a pair of springcontact arms when the switch 1s in: operative position.

A further object is to provide a coil spring surrounding the plungerwhich is placed under tension when the plunger is projected and whichwill move the plunger to an inoperative osition as soon as the end ofthe plunger is isengaged from the spi-ing contact arms.

In the accompanying drawings I have shown one embodiment of theinvention. In this showing,

Figure 1 is a perspective view of the- .of arms 3 are arranged on theback of the block and secured thereto by means of .bolts 4. The ends ofthe bolts project from the back of the block and are adapted to receivenuts 5 forming binding posts for lead wires not shown). As shown theterminals'of t e spring arms are extended over the ends of the block asindicated at 6. The block is ada ted to be arran ed in the rearpof apanel i; which is 'provided with an opening 8 in alinement with theopening in the block. The arms 3 extend at an angle from the'rear faceof the block toward each other as indicated at 9 and are provided withoifset ends 10.

A plunger is mounted in the openings, in the block and the panel and isadapted to bridge the space between the ends 10 of the s ring contactarms when the switch is in closed position. As shown a sleeve nut 11 isarranged in the openings 2 and 8 and is provided with external threadsto engage the internal threads formed in the opening 2. A washer 12surrounds this nut and the nut is provided with an enlarged head 13which contacts with the outer face of the lcontact arms when the washer.A plunger is mounted within the nut and the plunger consistsof a handleportion 14 and 'an inner portion 15. As shown, the handle portion isprovided with a head 16 onits outer end 'to facilitate operation of theswitch and intermediate the 'ends it isprovided with a collar 17 whichis l adapted to engage the head 13 of the nut to limit the inwardmovement of the plunger. The inner end of the handle portion of theplunger is provided with a central threaded bore -18 adapted to receiveathreaded portion 19 formed on the inner portion of the plunger. A coilspring 20 is arranged within the nut beneath the inner end of thehandleportion of the plunger. The inner portion o the. plunger is providedwith an enlargement or ball 21 on its inner end adapted to engage theends 10 of the Spring switch is inthe operative position shown in fulllines in Figure 2 of the drawings.

The operation of the device will be apparent from the foregoingdescription. When 30 the switch is to be turned on the plunger is movedinwardly to the full line position shown in Figure 2 of the drawings.The space between the ends 10 of the spring contact arms. is normallyless than the diameter of the ball 21 as shown in dotted lines in Figure2 of the drawings whereby the inward movement of the plunger forces thearms out under tension and causes them to engage the ball 21 and holdthe plunger in its inner position. While in this position. the coilspring 20 is placed under tension. When the switch is to be turned 0Ethe plunger is moved outwardly and as soon as the head 421 becomesdisengaged from the ends 10 of the spring contact arms the spring 20moves the plunger outwardly to its limit as indicated in dotted lines inFigure 2 of the drawings to insure breaking the circuit.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes in the shape, size, and arrangement `of parts may beresorted to without departing om the spirit of the invention or thescope of the subjoined claim.

Having describedmy invention, I claim z.,

In a device of the character descri a lll base having a threadedopening, .a sleeve nut mounted in said opening, aplunger mounted in saidsleeve, said plunger comprising a handle rtion and an inner portionsmaller in ameterv than the handle portion, the inner end of said handleortion being provided with a threaded ore vadapted to receive the end ofsaid inner portion, a. spring arranged in said sleevey nut -surroundingthe inner portion of said plunger and adapted to engage the end of saidl0 handle portion to normally /maintain the the inner end of saidplunger whereby said 15 arms will be placed under tension when saidplunger is moved inwardly and wvlll Yretain saidplun er in saidposition.

In testimonyw ereof I affix my signature.

HUGO GERNSBACK.

